Roof



J. H. GRIFFIN ROOF Filed Nov. 7, 1927 Sept. 17, 1929.

wlTNEssEs @La y Patented Sept. 17, 1929 n UNITED STATES nPATENT oFFl'cE' JAMES H. GRIFFIN, OF GRANTWOOD, NEW JERSEY ROOF Application led November?, 1927. Serial No. 231,713.

rlhe present invention while applicable to water-tight lioors orfanalogous structures is primarily adapted for incorporation in a roof, and the term roof will be used o throughout the specification and claim, it being understood that the term is to be broadly 20 pressed into the mastic until thelatter, partially or completely, fills the interspaces between them and lies approximately flush with the surface of the slate. In some instances where the mastic does not completely ll'the interspaces a grout of Portland cement mixture may be used between the adjacent slates.

The invention is well suited for application .to a new roof or for recovering an ol roof. A light proof construction is provided which permits the use of slate on extremely low pitched roofs when slate shingles have heretofore been considered unsuitable due to the fact that rain beats in under them.

Special means may also be provided for anchoring the slatev on an extremely steep roof so that the slate is securely held against slippage even in case of a fire softening tlie mastic.

With the labove noted and other objects in view the invention consists in certain novel features of construction and combinations and arrangements of parts, which will be more fully hereinafter described and pointed out in the claim. u

Figure 1 is a fragmentary side elevational view of an inclined roof with part of the waterproofing, mastic and slate laminations broken away to .expose the material beneath 5P them; f

Figure 2 is a transverse sectional detail on l the line 2-2 of Figure 1 Figure 3 is a sectional view illustrating a modiiication and taken on the line 3-3 of Figure 5;

Figure 4 is a section showing the use of a cement grout between the interspaces of the slate; and

Figure 5 is a plan 'view of the modification shown in Figure 3.

As suggested above, the present construction and method may involve the use of either tile or slate. To avoid the u'se of alternate expressions in the specification and claim I shall simply use the word slate, intending to e cover thereby tiles or equivalent materials.

In the drawings, I have used the reference numeral 10 to designate the boards of a roof. Laid directly upon the boards and secured thereto by cementinv or in any other suitable manner is a layer of' waterproof material 11 of felt, burlap or the like. Spread upon the burlap 11 is a trowel coating 12 of a quick setting mastic, such for instance as the mastic disclosed in my copending application, Serial No. 116,202, filed June 15, 1926. It will be recalled that this mixture consisted of asd `phalt and asbestos liber and had a melting point of approximately 160 Fahr.

The slate 13 is then lai'd in the mastic, the slates being pressed in until the mastic is forced up into the interspaces between them, preferably filling such interspaces and lying flush with the outer faces of the slate. In instances where the interspaces are not completely filled they may be packed with a cement grout, as indicated at 14 in Figure 4.

It will be noted that the adjacent slates do not overlap but are laid in rows, with the slates of one row staggered relatively t'o the slates of an adjacent row.

A high melting point, quick setting mastic such as described above will be substantially set bythe time the slate has been pressed into position, due to the cooling elect of the slate.

The weight of the slate is only about onethird of that employed ordinarily where the slate shingles are overlapped.

Where this method is used on a very steepl .1'90f I Prefer t0 guard against accidental slippage of the slate in case the mastic becomes softened by the intense heat of a burning building. With this in View, )I use securing devices consisting of wire rods 15 (Figures 3 and 5) which are embedded in the trowel coating of the mastic. rThese rods at one end are'formed with pointed extensions 16, driven into the roof boards 10, and at their other ends with upstanding hook portions 17 disposed in the interspaces between adjacent slates and retaining the upper slate against downward movement. The rod l5 may either` lie between two laterally adjacent slates or may be concealed under a slate.

Obviously various changes might be made both in the roof and in'the method of laying it without departing from the spirit and scope of the appended claim.

i claim:

A root, including a waterproof base, a mastic thereon, slates set in the mastic, the mastic substantially lling the intei'spaces between slates, and wire rods having pointed ends driven into the base, the intermediateportions of the rods being embedded in the mastic layer and the other ends of the rods being upturned to slates.

Signed at New York in the county of New York, and State of New York this 4th day ci November,A.D. 192'?. I

JAMES H. GRFFN.

Macnee prevent sliding movement of the 'l 

